Postoperative nausea and vomiting

A 2008 study compared 121 Japanese patients who experienced PONV after being given the general anesthetic propofol to 790 people who were free of postoperative nausea after receiving it. Those with a G at both copies of rs1800497 were 1.6 times more likely to experience PONV within six hours of surgery compared to those with the AG or AA genotypes, but they were not significantly more likely to experience PONV more than six hours after surgery.[2]

PONV results from patient, surgical, and anesthetic factors.

Surgical factors that confer increased risk for PONV include procedures of increased length and gynecological, abdominal, laparoscopic and ENT procedures, and strabismus procedures in children.

Anesthetic risk factors include the use of volatile anesthetics, nitrous oxide (N₂O), opioids, and longer duration of anesthesia.

Patient factors that confer increased risk for PONV include female gender, obesity, age less than 16 years, past history of motion sickness or chemotherapy-induced nausea, high levels of preoperative anxiety, and patients with history of PONV.

Smokers and the elderly often have a decreased risk for PONV.

A risk-stratification method created by Apfel et al has been developed to determine a patient's risk for PONV. The presence of 0, 1, 2, 3, or 4 of any of the following risk factors corresponds to a PONV respective risk of 10, 20, 40, 60, and 80%.[3]

- Female gender

- Non-smoking

- History of PONV or motion sickness

- Expectant use of postoperative opioid medications

Fasting guidelines often restrict the intake of any oral fluid 2-6 hours preoperatively, but in a large retrospective analysis in Torbay Hospital, unrestricted clear oral fluids until transfer to theatre could significantly reduce the incidence of postoperative nausea and vomiting without an increased risk in the adverse outcomes for which such conservative guidance exists.[4]

A multimodal approach to treating a patient with PONV can be efficacious. Numerous patient factors and medication adverse effects must be taken into consideration when selecting a treatment regimen.

• Serotonin (5-HT3) receptor antagonists can be administered as a single dose at the end of surgery. Adverse effects include prolongation of the QT interval on electrocardiogram (EKG). Medications include ondansetron, granisetron, and dolasetron.
• Anticholinergics can be used as a long-acting patch placed behind the patient's ear. Adverse effects include dry mouth and blurry vision. Care must be taken when handling the patch, as transfer of medication to the eye can induce pupillary dilation. Avoid use in elderly patients. Medications include scopolamine.
• Glucocorticoids have direct antiemetic effects and can reduce need for postoperative opioids. Adverse effects include a transient increase in serum glucose level, and poor wound healing (controversial). Medications include dexamethasone.
• Butyrophenones are typically administered as a single injection at the end of surgery. Adverse effects include prolongation of the QT interval on EKG. Medications include droperidol and haloperidol.
• Phenothiazines are particularly effective in treating opioid-induced PONV. Adverse effects are dose-dependent and include sedation and extrapyramidal symptoms. Medications include promethazine and prochlorperazine.
• Neurokinin 1 (NK1) receptor antagonists prevent an emetic signal from being transmitted. Medications include aprepitant and rolapitant.
• Histamine receptor antagonists can be administered by multiple routes, including orally, intramuscularly, or rectally. Adverse effects include dry mouth, sedation, and urinary retention. Medications include dimenhydrinate and diphenhydramine.
• Propofol, an anesthetic medication, confers its own antiemetic properties.

The 2020 Cochrane Anaesthesia Review Group review of Drugs for preventing postoperative nausea and vomiting in adults after general anaesthesia: a network meta-analysis (Review) [6] demonstrated that combination therapy is more effective than single anti-emetic, and that dexamethasone and ondansetron (a commonly used combination) are two of the most effective anti-emetics for PONV. The review adds robust evidence of efficacy for drugs in newer classes, such as aprepitant or fosapreitant, or newer agents in familiar classes, such as ramosetron. The review does not cover the cost effectiveness of the agents included and, despite increased efficacy for newer novel agents, this may preclude their immediate utilisation in anaesthetic practice.

In conjunction with antiemetic medications, at least one study has found that application to the pericardium meridian 6 acupressure point produced a positive effect in relieving PONV.[7] Another study found no statistically significant difference.[8] The two general types of alternative pressure therapy are sham acupressure and the use of the P6 point. A 2015 study found no significant difference between the use of either therapy in the treatment or prevention of PONV. In a review of 59 studies, both therapies significantly affected the nausea aspect, but had no significant effect on vomiting.

Cannabinoids have also been used for treatment of PONV, but its safety and efficacy are controversial.